Multiplex reproducing



y 1931! R. H.. RANGER 1,807,012

MULTIPLEX'REPRODUCING Filed May 5. 1929 2 Sheets-Sheet 1 INVENTOR R. H. RANGER 7%W L ATTORNEY May 26, 1931- R. H. RANGER MULTIPLEX REPRODUCING Filed May 3, 1929 2 Sheets-Sheet 2 INVENTOR R.H.RANC1ER 7 .Mm ATTORNEY Patented May 26, 1931 UNITED STATES PATENT OFFICE RICHARD HOWLAND RANGER, 0F NEWARK, NEW'J'ERSEY, ASSIGNOR TO RADIO COR- i PORATION OF AMERICA, A CORPORATION OF DELAWARE MULTIPLEX REPRODUCING Application filed May 3, 1929.

10 of distinct lines of a facsimile or a television subject, the speed andefliciency of transmission can be considerably increased and the time element for transmitting and receiving a picture or television system may be considerably reduced.

. As has been disclosed inmy copending application, Serial No. 360,066, filed May 3,

1929, I have provided a method and means by which a facsimile message or a television subject may be simultaneously analyzed along a plurality of adjacent or even separate paths, and the present invention is particularly directed to a receiving system for use in conjunction with an analyzing system of thetypc disclosed in the said copendingapplication.

As a primary object of my invention, I have, therefore, sought to develop a method and means by which a plurality of distinct light paths may be traced upon either a light sensitive recording medium in case of fac simile or picture transmission, or upon a screen, or the like, in conjunction with television transmission. 1 g

Still another object of my inventionis to provide a method and means "by which the separation of the individual light paths for recording is produced.

' Still other objects of my invention are to provide, in a method to be hereinafter set forth, an arrangement for tracing a plurality of light paths corresponding to the intensity of light andshadow on elemental areas of a facsimile or television subject which isrelatively simple in its construction and arrange-. ment of parts, a system which is compact, conveniently installed, easily set up, readily operated, and efficient in its use.

Further and ancillary objects of my invention will at once suggest themselves and become apparent to those skilled in the art Serial No. 360,068.

to which the invention relates from a consideration of the drawings forming a part of my present .disclosure when said drawings are read in conjunction with the following specification and claims.

By Fig. 1 of the drawings, I have illustrated an arrangement for tracing a pair of individual light paths either along a light sensitive record or. upon a screen; and,

By Fig. 2 of the drawings, I have illustrated a system whereby five distinct lines or paths of light may be traced, supposing that the system is applicable to a five channel multiplex communication system.

It is, however, to be understood that while the invention has been illustrated as being applied to only two and five channels of multiplex communication that the invention is not limited thereto but that the number of channels may be any desired and suitable number without diverting from the spirit and scope of my invention.

Also, while the receiving circuits operate in conjunction with transmission circuits", such as have been disclosed in certain of my copending applications, particularly appli-. cations, Serial No. 269,099, filed April 11, 1928; Serial No. 309,274, filed September 29, 1928; and Serial No. 349,076,filed March 22, 1929, for example, it is to be understood that the receiving circuits operating in conjunction with the arrangement herein disclosed amplifying system working in conjunction with suitable and proper filters for distinguishing between the different tone frequencies used and provide for separating the various light bands, the output of which may then be directed to any proper form of inclieating system. I

Also, as the invention has herein been illustrated as being applied particularly to radio transmission, it is nevertheless likewise applicable to wire or wired radio systems, and by use of the term radio, I wish to include all types of known communication systems. Likewise, the term pictures as herein used should be interpreted in a generic sense so as to. include, television subjects, motion picture films, views, photographs, newspaper foreign languages, and the like.

Now referring more particularly to the drawings forming a part of the present disclosure, signals from the various" filtering systems set forth in the above namedcopending applications may be directedto appropriate forms of glow lamps, such as the general type shown and described in connection with copending application, Serial No. 350,922,

filed March 29, 1929, by R. M. WVilliams, or any other well known type ofillumination means such as an ordinary electric lamp and the like.

Referring first to Fig. 1 of the drawings, the signal energy'rec eived from the various filtering systems corresponding to the separate tones produced inthe transmission of the multiplex message is directed to each of the glow lamps, 1 and 3 respectively, in which a glow corresponding to the intensity of light and shadow on elemental areas of the picture surface is produced. As has been shown, the

glow issuing from .thelamps 1 and 3 is then projected in a longitudinal direction therefrom so as to pass through a diaphragm arrangement-5 or 7. Thediaphragm may be adjustable along axes at right angles to each other so that the size of the openings 9 and 11 therein may be varied :at will so as to increasev or decrease the size"thereof." Light thusp-rojected through the openings9 and 11 in the diaphragm members 5 and 7 may then be projected through lens systems 13 and 15 from which the individual paths of light are projected to right angle prisms 17 and 19respectively. 1 v I 'The prisms 17 and 19 are preferably mounted upon brackets 21 and 23 which are adj ustably mounted on any suitable and de sired supportmeans 25 and 27 so that they may be adjustable in the direction shown by the arrows adjacent each of the support means. This adjustment is at times neces sary so that the light which is reflected from the faces 29 and 31 of the prisms 17 and 19 respectively may be projected along the de-' sired path so as to reach a second pair of reflectingprisms 33 and 35 from the faces 37 and 39 of which the light is again bent at arrow thereon. As will beseenythelight system 43 may then be focused as two distinct and independent but nevertheless adjacentpoints of light 53 and 55 upon the record surface 49.

If the record surface. 49 is made sensitive to light, it will readily lee-seen that-light rays produced and issuing from the sources 1 and 3 will trace paths on the recording surface 49 corresponding to the elemental tones on the individual paths of the record surface as analyzed in accordance with an analyzing system of the usual type shown and described in connection with my copending application, Serial No. 360,066, filed May 3, 1929. Y Now referring to Fig. '2 of thedrawi-ngs, I have illustrated a further modification-of the scheme above described in connection with theillustration of Fig. 1*, wherein an arrangement capable of tracing five distinct paths of light on a record surface has been illustrated. s a

To refernow more particularly to the disclosure of Fig. 2, a plurality of'glow lamps or {other appropriate lightsources,2, 4,96, 8,

and 10, are arranged to be independently influenced by signals received through any appropriate and desired form of multiplex ireceiver so as to produce, when "energized, a glow in accordancewith the intensity of light and sh adow on the particular picture surface or television subject being reproduced at the particular time. The light issuing from each of the sources, 2, 4,6,8 and 10, has been indicated conventionally by the letters*a,-b, c, d and erespectively.

These light beams may then bedirected through adiaphragm12 having openings-14,

16,18, 20 and 22 therein for each of the in: dividual lightbeams'to pass through. VVhile the diaphragm member 12 in Fig.2 has not been shown as being adjustable as'to the size of the various openings therein,- 1t 1s,l10w-- ever, within the-scopeof my disclosure to provide adjustment in twodire'ctions in connection with this type of diaphragm "so that, forexample, if each of the openings are of square formation, the area of eachropening may be either increased or decreased by a propriately adjusting the diaphragm memher 12 from either of two directions, or may be made elongated by only adjusting thedia phragm in one direction as has'been disclosed by *my cop'ending application, Serial No. 360,066, filed: May 3, 1929 for example.

As the light beams, a, 6, 0,05, and 6 respectively, pass beyond the di aphragmmeinber 12, they are projected*respeotivelyupon prisms 24, 26, 36, 30 and 28, which may be appropriately arranged to deflectf'the path of the individual-light beams in a predetermined and chosen manner so as to ultimately collect allof the separate beams within a relatively small space. It wiubemn that the light beam a passing beyond'theprism24 is directed to still a second prism 32 and therefrom projected or deflected at right angles through a glass supporting plate 42 so as to impinge upon a relatively large prism 44. Similarly, light projected along the path d is reflected or deflected by the prism 30 against a prism 34 also carried by the glass supporting plate 42 and then directed to the prism 44. As has been shown, the light issuing from the source 6 along the path 0 passes directly through a square prism 36 also carried by the glass supporting plate 42 to the prism 44. In this case, it will be noted that the light beam has not been changed as to its path since, as has been shown, the light source 6 is arranged at the center of all of the other light sources, and, therefore, the light issuing from each of the adjace-nt sources is ultimately grouped about this particular light beam. In like manner, the light issuing from the source 4 and projected along the path 6 is reflected and deflected by the prism 26 to the prism 38 and projected through the glassplate'42 to the prism 44 along the path I), and, in like manner, light projected along the path 6 is passed through the prisms 28 and 40 as well as the glass supporting plate 42 to the prism 44. g

All of the light beams, a, b, 0, d, and e are then reflected from the face 46 of the prism 44 and arranged to pass through a lens system, formed of a pair of condensing lenses, 48 and 50 respectively, so as to focus as independent points of light upon a record surface 62 carried about a supporting drum 64 turned upon its axis 66 in the direction shown by the arrow, for example. It will be seen from the accompanying drawings that the light beam at is projected as a point 52 on the record surface 62, the light beam (1 projected as a point 54, the light beam 0 as a point 56, the light beam d as a point 58, and the light beam 0 as a point 60.

While I har e herein shown my invention as applied to recording facsimile messages,

wherein the record drum 51 may be turned in the direction shown by the arrow so that the picture may be produced along a path corresponding to a helix having a pitch which is determined by the desired amount of detail in the picture and also by the number of dis tinct and independent paths of recording, or which may be traced upon a record surface in which either the recording drum or the light source for illuminating the. same move relative to each other, it is also readily seen that the same principle of invention may be applied to television systems wherein the individual paths of light as projected from the reflecting prisms of Figs. 1 and/or 2 may be projected through lenses, or the like, so as to trace a plurality of distinct and independent paths upon a screen and thus reproduce a television image.

It will also be readily understood that certain modifications and changes may be made to the invention herein disclosed, and I,-therefore, desire to be limited in so far as the modifications which I may make to the system herein set forth only in so far as the spirit and scope of the hereinafter appended claims necessitates.

Having now described my invention, what I claim and desire to secure by Letters Patent is the following:

1. A system for reproducing pictures in multiplex transmission systems which" includes a plurality of glow lamps, means for producing a glow in each of said lamps in accordance with the intensity of light and shadow on elemental areas of a transmitted picture, means for projecting the liglit'issuing from-each of said glow lamps along predetermined paths, condensing means for collecting the light beams issuing from each of said sources and confining the said beams to a predetermined illuminated area, and means for projecting each of said light beams at different adjacent points on a received record surface. I

2. A system for reproducing pictures in multiplex picture transmission systems which includes a plurality of glow lamps for producing glow in accordance with the intensity of light and shadow on elemental areas of a picture to be reproduced, means for separating the glow issuing from said glow lamps into predetermined paths corresponding in number to the number of channels forming the multiplex communication system, means for collecting the light issuing from each of said glow lamps, means for projecting each of said independent paths of light along a predetermined path, and a single reflecting means for projecting each of said independent light beams along closely adjacent paths to a plurality of adjacent points on a surface for reproducing a transmitted picture.

3. A system for reproducing pictures in multiplex transmission system which includes a plurality of glow lamps, means for producing a glow in each of said lamps in accordance with the intensity of light and shadow on elemental areas of a transmitted picture coordinated with each of said lamps, means for projecting the light issuing from each of said glow lamps along predetermined paths, a prism in the path of'all of said light beams for collecting the light beams issuing from each of said sources and confining the said beams to a predetermined illuminated area, and means for projecting each of said light beams at different adjacent points on a received record surface.

4. A system for reproducing pictures in multiplex picture transmission systems which includes a plurality of light sources for producing illumination proportionate to the intensity of light and shadow on elemental areas of a picture to be reproduced, a diaphragm for separatingthe light issuing from said sources into predetermmedpaths corresponding, in

number to the vnumber of channels forming the multiplex communication system, a refleeting prism for collecting the light'issuing fromea ch-of said light sources, means for projecting each of said independent paths-of light along a predetermined'patmand a-single reflecting means for projecting each of said independent light beams to a plurality of adj acentpoints on a surface for reproducing a transmitted picture.

' 5. A system for reproducing pictures as a plurality of adjacent recorded points-in multiplex communication systems which includes a plurality oflight sources energized in accordance With the intensity of light and shadow on elemental areas of a transmitted picture, means for confining the light-issuing from each of :said sources to predetermined paths, reflectin'gmeans in the path of each of said lightbeamsfor directing the said-beams f along predetermined paths, and-a single refleeting means in the pathof all of said redirected light heams for projecting all ofsaid light beams along closely; adjacent parallel paths, and means for projecting all of said light beams at adjacent points'on'a record surface for reproducing a picture.

RICHARD- HOWLAND RANGER. 

